DENAFRIPS IRIS Manuale utente

V1.0

19th July 2020

IRIS

DDC

OWNER’S MANUAL

Contents

1. INSTALLATION & SAFETY INSTRUCTIONS ........................................................................... 2

2. INTRODUCTION .................................................................................................................. 3

3. DESIGN HIGHLIGHTS ........................................................................................................... 4

3.1 DIGITAL ISOLATION ..................................................................................................... 4

3.2 FEMTO CRYSTAL OSCILLATOR ..................................................................................... 4

3.3 ADAPTIVE FIFO BUFFER RECLOCKING ......................................................................... 4

3.4 PROPRIETARY, STATE-OF-THE-ART USB INTERFACE ................................................... 5

3.5 DDC ARCHITECTURE .................................................................................................... 5

3.6 CLOCK IN ...................................................................................................................... 5

4. OPERATING INSTRUCTION .................................................................................................. 6

4.1 Quick Start Guide ........................................................................................................ 6

4.2 USB DRIVER INSTALLATION – WINDOWS OS ............................................................ 10

5. SPECIFICATIONS ................................................................................................................ 14

6. WARRANTY ....................................................................................................................... 15

1. INSTALLATION & SAFETY INSTRUCTIONS

This DDC is designed and built to provide trouble-free performance, but as with all

electronic devices it is necessary to observe a few precautions:

 Unpack the DDC carefully.

 Position the DDC on a stable, horizontal surface, i.e. sturdy rack.

 The DDC supports 100/250VAC mains voltage. Please check the voltage switch

underneath the DDC, switch it to the correct voltage before connecting the AC

mains. Please connect the AC power cord with earth(ground) pin unless it is

absolutely required to reduce hum from the ground loops of the connected devices.

 Always ensure that when disconnecting and reconnecting your audio equipment the

mains supply is turned off.

 Position the power cord and signal interconnects where they are not likely cause trip

and fall hazard.

 Do not use the DDC near water, or place water-filled containers on the DDC. Entry of

liquid into the DDC is hazardous and may cause electric shock and/or fire hazard.

 Do not place the unit under direct sunlight or heat source.

 Do not remove any covers or try to gain access to the inside. There are no user

adjustments or fuses to change without qualification.

 Clean regularly with a damp soft cloth. Do not use any cleaning agents as it might

damage the surface finishing.

 The electronics in modern hi-fi equipment is complex and may, therefore, be

adversely affected or damaged by lightning. For protection of the audio system

during electrical storms, disconnect the mains plugs.

2. INTRODUCTION

Thank you for purchasing the DENAFRIPS IRIS DDC.

The entry DDC, built upon the success of the DENAFRIPS Digital Know-How. IRIS DDC isolates

and buffers the USB input data, re-clock them via the local FEMTO Crystal Oscillators. The

cleansed, ultra-low jitters digital output can be connected to any external DAC.

It transforms the Computer Audio System into a high-quality transport. The sonic

improvement is evident as soon as the IRIS DDC is added into the Digital Audio chain.

3. DESIGN HIGHLIGHTS

3.1 DIGITAL ISOLATION

The IRIS Digital Signals are completely isolated by the 50-Mbps high speed photocouplers.

The optical isolation yields even lowered noise-floor and achieved high signal to noise ratio.

3.2 FEMTO CRYSTAL OSCILLATOR

The IRIS is equipped with dual FEMTO Clocks operating at audio frequencies 45.1584Mhz,

49.152Mhz. The dual FEMTO Clocks are powered by the o-core transformer, multi-stages

linear regulators. The clean linear power supply ensure superior stability and linearity of the

FEMTO Clocks output frequency.

3.3 ADAPTIVE FIFO BUFFER RECLOCKING

The DENAFRIPS approach to address the jitters issue by FIFO BUFFER RECLOCKING. The

adaptive FIFO buffer store the source digital audio data in the memory. These data are read

from the memory using the FEMTO CLOCK, located right in the DDC.

3.4 PROPRIETARY, STATE-OF-THE-ART USB INTERFACE

The IRIS is equipped with the proprietary USB Audio Solution, powered by STM32F446

Advanced AMR Based MCU. DENAFRIPS redesigned and optimized circuitry, allow the DDC

to be used as high-end DDC with computers / streamers. It supports 24bit/768kHz PCM data

stream, and native processing of DSD up to DSD1024. It comes with licensed THESYCON USB

Driver for Windows Platform.

NOTE: The USB Module is designed to trigger on only when USB Input is selected. This is

intended design to reduce digital input interfaces cross-interference for best sound

reproduction.

3.5 DDC ARCHITECTURE

DIGITAL SIGNAL PROCESSING – All digital input data are stored in the on-board FPGA high-

speed RAM.

FEMTO CLOCKS – These data are read from the memory using the ultra-low phase noise,

super accurate FEMTO CLOCKS, located right in the DDC. The processed data are sent to the

digital outputs.

DIGITAL OUTPUTS – The cleansed, ultra-low jitters data are output via multiple digital

output interfaces simultaneously to the external DAC.

3.6 CLOCK IN

The IRIS supports clock in of audio frequencies 45.1584Mhz, 49.152Mhz. It makes a perfect

companion with the TERMINATOR-PLUS to synchronize the CLOCKS.

4. OPERATING INSTRUCTION

4.1 Quick Start Guide

Figure 1. Front Panel

(1) Setup Button

Press the setup button once to enable/disable the CLOCK-IN feature.

 Press Setup button once

 CLOCK light should be on/off as the Setup button is pressed momentarily

 CLOCK light on = Enable clock in

 CLOCK light off = Disable clock in

(2) Digital Audio Signal Input Sampling Rate

The following table illustrate the Input Sampling Rate LED status.

Base Sampling Rate Indicator Input Format

44.1 kHz

44.1K 44.1 kHz

88.2K 88.2 kHz

176.4K 176.4 kHz

352.8K 352.8 kHz

705.6K 705.6 kHz

48 kHz

48K 48 kHz

96K 96 kHz

192K 192 kHz

384K 384 kHz

768K 768 kHz

DSD

64 DSD 64

128 DSD 128

256 DSD 256

512 DSD 512

Table 1. Sampling Rate

Figure 2. Read Panel

Description:

(1) AC Power Supply

CAUTION! IRIS supports AC mains range from 100-250VAC. Please check the voltage switch

underneath the DDC, switch it to the correct voltage before connecting the AC mains.

(2) Digital Input Interface

IRIS support USB input only.

(3) Digital Output Interface

There are 5 Digital Output Interfaces, namely, COAX, AES, OPT, I2S-A, I2S-C. All outputs are

active simultaneously.

I2S-A HDMI (LVDS) I2S-C RJ45 (LVCMOS)

(4) CLOCK IN

The IRIS supports the following clock frequencies input, leveraging the high-quality OCXO of

the TERMINATOR-PLUS DAC, it may be connected to IRIS CLOCK-IN to improve the sonic

performance.

MASTER CLOCK

 45.1548MHz, 49.152Mhz

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